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714 Chapter 21
Copyright © 2017 Pearson Education, Inc.
CH(CH
3
)
2
NHCH O
−
CH
2
OH
CH
CH
CH
O
−
CH(CH
3
)
2
N-protected valine
O C
N
NH
DCCD
an imidate
+
O C
N
NH
H
C
O
C
O
C
O
C
O
CH(CH
3
)
2
H
2
NCH O
−
CH
2
OH
C
O
NH
(CH
3
)
3
CO
C
O
NH
(CH
3
)
3
CO
C
O
NH
(CH
3
)
3
CO
C
O
34.
2. H
2
NCH
1. DCCD
O
−
Ala
CH
3
C
O
N-protected Leu
NHCH O
−
CH
2
CH(CH
3
)
2
(CH
3
)
3
CO
(CH
3
)
3
CO
OC(CH
3
)
3
+
H
2
NCH O
−
CH
2
CH(CH
3
)
2
Leu
NHCH
CH
2
CH(CH
3
)
2
(CH
3
)
3
CO
1. DCCD
2.
H
2
NCH O
−
CH
2
NHCH O
−
CH
2
Phe
O
C
O
C
O
C
O
C
O
C
O
C
O
C
O
C
O
C
O